Schlagwort-Archive: security

RFC 3711: The Secure Real-time Transport Protocol (SRTP)

Network Working Group                                         M. Baugher
Request for Comments: 3711                                     D. McGrew
Category: Standards Track                            Cisco Systems, Inc.
                                                              M. Naslund
                                                              E. Carrara
                                                              K. Norrman
                                                       Ericsson Research
                                                              March 2004

             The Secure    (SRTP)
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Veröffentlicht unter Internet | Verschlagwortet mit , , , , , | Hinterlasse einen Kommentar

What is a firewall?

A („fire wall“) is a tool to control the transfer of data over a network and restrict to the allowed. Of interest is particularly the data transfer between your local network and the public internet, because unauthorized access from outside and unauthorized transmission from the inside has to be stopped to protect your private data.

Basically, it controls which program might use which port to transmit data. A computer connected to the Internet uses connections at port 80 and 443 („are opened“) because they are the ports for HTTP (1.0, 1.1) and HTTPS (secure HTTP). If you want to download your email via POP3, you need to open port 110 (POP3), and port 25 (SMTP) to send mail and so on.

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Veröffentlicht unter Internet | Verschlagwortet mit , | Hinterlasse einen Kommentar